[1.8.x] Fixed #25393 -- Fixed MySQL crash when adding text/blob field with unhashable default.

Backport of 4d933ad4181a511f3ced98edba4e17aff054e0e2 from master

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/schema/tests.py b/tests/schema/tests.py
index aa35bfddc9..d4a411ecfe 100644
--- a/tests/schema/tests.py
+++ b/tests/schema/tests.py
@@ -1535,3 +1535,15 @@ class SchemaTests(TransactionTestCase):
             cursor.execute("SELECT surname FROM schema_author;")
             item = cursor.fetchall()[0]
             self.assertEqual(item[0], None if connection.features.interprets_empty_strings_as_nulls else '')
+
+    def test_add_textfield_unhashable_default(self):
+        # Create the table
+        with connection.schema_editor() as editor:
+            editor.create_model(Author)
+        # Create a row
+        Author.objects.create(name='Anonymous1')
+        # Create a field that has an unhashable default
+        new_field = TextField(default={})
+        new_field.set_attributes_from_name("info")
+        with connection.schema_editor() as editor:
+            editor.add_field(Author, new_field)